Patents by Inventor Katsuyuki Takabayashi

Katsuyuki Takabayashi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Novel method for determining cholinesterase activity
    Patent number: 4717659
    Abstract: In a method for determining cholinesterase (hereinafter referred to as ChE) activity, the improvement comprising by using, as a substrate, a protocatechuoylcholine derivative represented by the general formula (I), ##STR1## (wherein X is a halogen atom). The method for determining ChE activity according to the present invention is free from defects of the conventional methods, has many advantages and characteristics, permits accurate and simple determination of ChE activity, and can sufficiently contribute to determination of ChE activity in daily clinical examinations.
    Type: Grant
    Filed: May 6, 1985
    Date of Patent: January 5, 1988
    Assignee: Nitto Boseki Co., Ltd.
    Inventors: Katsumasa Kuroiwa, Katsuhiro Katayama, Katsuyuki Takabayashi, Takeshi Nagasawa
  • Method for measuring plasmin
    Patent number: 4605614
    Abstract: A method for measuring the activity of plasmin in plasma which comprises reacting a compound of the following formula or a salt thereof; ##STR1## with plasmin in a buffer solution having a pH of 7.2 to 7.6 and quantitatively determining the reaction product thereof.
    Type: Grant
    Filed: February 13, 1984
    Date of Patent: August 12, 1986
    Assignee: Nitto Boseki Co., Ltd.
    Inventors: Takeshi Nagasawa, Katsumasa Kuroiwa, Katsuyuki Takabayashi, Yoshio Nakamura
  • Method for determination of 5-aminosalicylic acid
    Patent number: 4529709
    Abstract: A method for the determination of 5-aminosalicylic acid, which comprises measuring the color developed in an alkaline medium by an oxidative condensation product formed by the condensation of an o-alkylphenol represented by the general formula ##STR1## (wherein R.sub.1 represents an ethyl, isopropyl or sec-butyl group) with 5-aminosalicylic acid of the formula ##STR2## in the presence of a peroxide.
    Type: Grant
    Filed: May 12, 1983
    Date of Patent: July 16, 1985
    Assignee: Nitto Boseki Co. Ltd.
    Inventors: Katsuyuki Takabayashi, Muneo Soeta, Takeshi Nagasawa
  • Method for measuring thrombin
    Patent number: 4520100
    Abstract: A novel substrate for measuring thrombin which has chromophoric and fluorescent properties on thrombin or a thrombin-like enzymes and is represented by a compound of the following general formula or a salt thereof: ##STR1## wherein R represents ##STR2##
    Type: Grant
    Filed: February 10, 1984
    Date of Patent: May 28, 1985
    Assignee: Nitto Boseki Co. Ltd.
    Inventors: Takeshi Nagasawa, Katsumasa Kuroiwa, Katsuyuki Takabayashi
  • Substrates for measuring plasmin
    Patent number: 4452736
    Abstract: A novel substrate for measuring plasmin which has chromophoric and fluoroescent properties against plasmin or a plasmin-like enzyme, which is characterized by being a compound of the formula or a salt thereof: ##STR1## wherein ##STR2## wherein ##STR3## .
    Type: Grant
    Filed: September 13, 1982
    Date of Patent: June 5, 1984
    Assignee: Nitto Boseki Co., Ltd.
    Inventors: Takeshi Nagasawa, Katsumasa Kuroiwa, Katsuyuki Takabayashi, Yoshio Nakamura
  • Substrates for measuring thrombin
    Patent number: 4450105
    Abstract: A novel substrate for measuring thrombin which has chromophoric and fluorescent properties on thrombin or a thrombin-like enzymes and is represented by a compound of the following general formula or a salt thereof: ##STR1##
    Type: Grant
    Filed: August 6, 1982
    Date of Patent: May 22, 1984
    Assignee: Nitto Boseki Co., Ltd.
    Inventors: Takeshi Nagasawa, Katsumasa Kuroiwa, Katsuyuki Takabayashi
  • Method for assaying the activity of .gamma.-glutamyl transpeptidase in serum
    Patent number: 4336331
    Abstract: Novel L-.gamma.-glutamyl-3-carboxy-4-hydroxyanilide of the formula, ##STR1## an acid addition salt thereof, or an alkali metal or amine salt thereof, which is useful for determining the activity of .gamma.-glutamyl transpeptidase.
    Type: Grant
    Filed: March 20, 1981
    Date of Patent: June 22, 1982
    Assignees: Nitto Boseki Co., Ltd., Iatron Laboratories, Inc.
    Inventors: Takeshi Nagasawa, Katsumasa Kuroiwa, Katsuyuki Takabayashi, Norimasa Takizawa, Kazuyo Hagihara, Tadami Akatsuka
  • Novel L-.gamma.-glutamyl-3-carboxy-4-hydroxyanilide and salts thereof
    Patent number: 4281181
    Abstract: Novel L-.gamma.-glutamyl-3-carboxy-4-hydroxyanilide of the formula, ##STR1## an acid addition salt thereof, or an alkali metal or amine salt thereof, which is useful for determining the activity of .gamma.-glutamyl transpeptidase.
    Type: Grant
    Filed: November 14, 1979
    Date of Patent: July 28, 1981
    Assignees: Nitto Boseki Co., Ltd., Iatron Laboratories, Inc.
    Inventors: Takeshi Nagasawa, Katsumasa Kuroiwa, Katsuyuki Takabayashi, Norimasa Takizawa, Kazuyo Hagihara, Tadami Akatsuka